I just planted 4 Ivy Leagues for Triage but they always go back to young. I check my garden twice a day and I always make sure that their needs are attended to. Also, they are beside Evil Magma peas and Garden gnome which to my knowledge are not among its dislikes. So, I don't know what seems to be the problem. I already harvested Evil Magma Peas twice and the Ivy Leagues just keep on going back to young after mature.